1use std::{
2 any::{TypeId, type_name},
3 cell::{BorrowMutError, Ref, RefCell, RefMut},
4 marker::PhantomData,
5 mem,
6 ops::{Deref, DerefMut},
7 path::{Path, PathBuf},
8 rc::{Rc, Weak},
9 sync::{Arc, atomic::Ordering::SeqCst},
10 time::{Duration, Instant},
11};
12
13use anyhow::{Context as _, Result, anyhow};
14use derive_more::{Deref, DerefMut};
15use futures::{
16 Future, FutureExt,
17 channel::oneshot,
18 future::{LocalBoxFuture, Shared},
19};
20use itertools::Itertools;
21use parking_lot::RwLock;
22use slotmap::SlotMap;
23
24pub use async_context::*;
25use collections::{FxHashMap, FxHashSet, HashMap, VecDeque};
26pub use context::*;
27pub use entity_map::*;
28use http_client::{HttpClient, Url};
29use smallvec::SmallVec;
30#[cfg(any(test, feature = "test-support"))]
31pub use test_app::*;
32#[cfg(any(test, feature = "test-support"))]
33pub use test_context::*;
34use util::{ResultExt, debug_panic};
35
36#[cfg(any(feature = "inspector", debug_assertions))]
37use crate::InspectorElementRegistry;
38use crate::{
39 Action, ActionBuildError, ActionRegistry, Any, AnyView, AnyWindowHandle, AppContext, Asset,
40 AssetSource, BackgroundExecutor, Bounds, ClipboardItem, CursorStyle, DispatchPhase, DisplayId,
41 EventEmitter, FocusHandle, FocusMap, ForegroundExecutor, Global, KeyBinding, KeyContext,
42 Keymap, Keystroke, LayoutId, Menu, MenuItem, OwnedMenu, PathPromptOptions, Pixels, Platform,
43 PlatformDisplay, PlatformKeyboardLayout, PlatformKeyboardMapper, Point, Priority,
44 PromptBuilder, PromptButton, PromptHandle, PromptLevel, Render, RenderImage,
45 RenderablePromptHandle, Reservation, ScreenCaptureSource, SharedString, SubscriberSet,
46 Subscription, SvgRenderer, Task, TextSystem, Window, WindowAppearance, WindowHandle, WindowId,
47 WindowInvalidator,
48 colors::{Colors, GlobalColors},
49 current_platform, hash, init_app_menus,
50};
51
52mod async_context;
53mod context;
54mod entity_map;
55#[cfg(any(test, feature = "test-support"))]
56mod test_app;
57#[cfg(any(test, feature = "test-support"))]
58mod test_context;
59
60/// The duration for which futures returned from [Context::on_app_quit] can run before the application fully quits.
61pub const SHUTDOWN_TIMEOUT: Duration = Duration::from_millis(100);
62
63/// Temporary(?) wrapper around [`RefCell<App>`] to help us debug any double borrows.
64/// Strongly consider removing after stabilization.
65#[doc(hidden)]
66pub struct AppCell {
67 app: RefCell<App>,
68}
69
70impl AppCell {
71 #[doc(hidden)]
72 #[track_caller]
73 pub fn borrow(&self) -> AppRef<'_> {
74 if option_env!("TRACK_THREAD_BORROWS").is_some() {
75 let thread_id = std::thread::current().id();
76 eprintln!("borrowed {thread_id:?}");
77 }
78 AppRef(self.app.borrow())
79 }
80
81 #[doc(hidden)]
82 #[track_caller]
83 pub fn borrow_mut(&self) -> AppRefMut<'_> {
84 if option_env!("TRACK_THREAD_BORROWS").is_some() {
85 let thread_id = std::thread::current().id();
86 eprintln!("borrowed {thread_id:?}");
87 }
88 AppRefMut(self.app.borrow_mut())
89 }
90
91 #[doc(hidden)]
92 #[track_caller]
93 pub fn try_borrow_mut(&self) -> Result<AppRefMut<'_>, BorrowMutError> {
94 if option_env!("TRACK_THREAD_BORROWS").is_some() {
95 let thread_id = std::thread::current().id();
96 eprintln!("borrowed {thread_id:?}");
97 }
98 Ok(AppRefMut(self.app.try_borrow_mut()?))
99 }
100}
101
102#[doc(hidden)]
103#[derive(Deref, DerefMut)]
104pub struct AppRef<'a>(Ref<'a, App>);
105
106impl Drop for AppRef<'_> {
107 fn drop(&mut self) {
108 if option_env!("TRACK_THREAD_BORROWS").is_some() {
109 let thread_id = std::thread::current().id();
110 eprintln!("dropped borrow from {thread_id:?}");
111 }
112 }
113}
114
115#[doc(hidden)]
116#[derive(Deref, DerefMut)]
117pub struct AppRefMut<'a>(RefMut<'a, App>);
118
119impl Drop for AppRefMut<'_> {
120 fn drop(&mut self) {
121 if option_env!("TRACK_THREAD_BORROWS").is_some() {
122 let thread_id = std::thread::current().id();
123 eprintln!("dropped {thread_id:?}");
124 }
125 }
126}
127
128/// A reference to a GPUI application, typically constructed in the `main` function of your app.
129/// You won't interact with this type much outside of initial configuration and startup.
130pub struct Application(Rc<AppCell>);
131
132/// Represents an application before it is fully launched. Once your app is
133/// configured, you'll start the app with `App::run`.
134impl Application {
135 /// Builds an app with the given asset source.
136 #[allow(clippy::new_without_default)]
137 pub fn new() -> Self {
138 #[cfg(any(test, feature = "test-support"))]
139 log::info!("GPUI was compiled in test mode");
140
141 Self(App::new_app(
142 current_platform(false),
143 Arc::new(()),
144 Arc::new(NullHttpClient),
145 ))
146 }
147
148 /// Build an app in headless mode. This prevents opening windows,
149 /// but makes it possible to run an application in an context like
150 /// SSH, where GUI applications are not allowed.
151 pub fn headless() -> Self {
152 Self(App::new_app(
153 current_platform(true),
154 Arc::new(()),
155 Arc::new(NullHttpClient),
156 ))
157 }
158
159 /// Assign
160 pub fn with_assets(self, asset_source: impl AssetSource) -> Self {
161 let mut context_lock = self.0.borrow_mut();
162 let asset_source = Arc::new(asset_source);
163 context_lock.asset_source = asset_source.clone();
164 context_lock.svg_renderer = SvgRenderer::new(asset_source);
165 drop(context_lock);
166 self
167 }
168
169 /// Sets the HTTP client for the application.
170 pub fn with_http_client(self, http_client: Arc<dyn HttpClient>) -> Self {
171 let mut context_lock = self.0.borrow_mut();
172 context_lock.http_client = http_client;
173 drop(context_lock);
174 self
175 }
176
177 /// Configures when the application should automatically quit.
178 /// By default, [`QuitMode::Default`] is used.
179 pub fn with_quit_mode(self, mode: QuitMode) -> Self {
180 self.0.borrow_mut().quit_mode = mode;
181 self
182 }
183
184 /// Start the application. The provided callback will be called once the
185 /// app is fully launched.
186 pub fn run<F>(self, on_finish_launching: F)
187 where
188 F: 'static + FnOnce(&mut App),
189 {
190 let this = self.0.clone();
191 let platform = self.0.borrow().platform.clone();
192 platform.run(Box::new(move || {
193 let cx = &mut *this.borrow_mut();
194 on_finish_launching(cx);
195 }));
196 }
197
198 /// Register a handler to be invoked when the platform instructs the application
199 /// to open one or more URLs.
200 pub fn on_open_urls<F>(&self, mut callback: F) -> &Self
201 where
202 F: 'static + FnMut(Vec<String>),
203 {
204 self.0.borrow().platform.on_open_urls(Box::new(callback));
205 self
206 }
207
208 /// Invokes a handler when an already-running application is launched.
209 /// On macOS, this can occur when the application icon is double-clicked or the app is launched via the dock.
210 pub fn on_reopen<F>(&self, mut callback: F) -> &Self
211 where
212 F: 'static + FnMut(&mut App),
213 {
214 let this = Rc::downgrade(&self.0);
215 self.0.borrow_mut().platform.on_reopen(Box::new(move || {
216 if let Some(app) = this.upgrade() {
217 callback(&mut app.borrow_mut());
218 }
219 }));
220 self
221 }
222
223 /// Returns a handle to the [`BackgroundExecutor`] associated with this app, which can be used to spawn futures in the background.
224 pub fn background_executor(&self) -> BackgroundExecutor {
225 self.0.borrow().background_executor.clone()
226 }
227
228 /// Returns a handle to the [`ForegroundExecutor`] associated with this app, which can be used to spawn futures in the foreground.
229 pub fn foreground_executor(&self) -> ForegroundExecutor {
230 self.0.borrow().foreground_executor.clone()
231 }
232
233 /// Returns a reference to the [`TextSystem`] associated with this app.
234 pub fn text_system(&self) -> Arc<TextSystem> {
235 self.0.borrow().text_system.clone()
236 }
237
238 /// Returns the file URL of the executable with the specified name in the application bundle
239 pub fn path_for_auxiliary_executable(&self, name: &str) -> Result<PathBuf> {
240 self.0.borrow().path_for_auxiliary_executable(name)
241 }
242}
243
244type Handler = Box<dyn FnMut(&mut App) -> bool + 'static>;
245type Listener = Box<dyn FnMut(&dyn Any, &mut App) -> bool + 'static>;
246pub(crate) type KeystrokeObserver =
247 Box<dyn FnMut(&KeystrokeEvent, &mut Window, &mut App) -> bool + 'static>;
248type QuitHandler = Box<dyn FnOnce(&mut App) -> LocalBoxFuture<'static, ()> + 'static>;
249type WindowClosedHandler = Box<dyn FnMut(&mut App)>;
250type ReleaseListener = Box<dyn FnOnce(&mut dyn Any, &mut App) + 'static>;
251type NewEntityListener = Box<dyn FnMut(AnyEntity, &mut Option<&mut Window>, &mut App) + 'static>;
252
253/// Defines when the application should automatically quit.
254#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
255pub enum QuitMode {
256 /// Use [`QuitMode::Explicit`] on macOS and [`QuitMode::LastWindowClosed`] on other platforms.
257 #[default]
258 Default,
259 /// Quit automatically when the last window is closed.
260 LastWindowClosed,
261 /// Quit only when requested via [`App::quit`].
262 Explicit,
263}
264
265#[doc(hidden)]
266#[derive(Clone, PartialEq, Eq)]
267pub struct SystemWindowTab {
268 pub id: WindowId,
269 pub title: SharedString,
270 pub handle: AnyWindowHandle,
271 pub last_active_at: Instant,
272}
273
274impl SystemWindowTab {
275 /// Create a new instance of the window tab.
276 pub fn new(title: SharedString, handle: AnyWindowHandle) -> Self {
277 Self {
278 id: handle.id,
279 title,
280 handle,
281 last_active_at: Instant::now(),
282 }
283 }
284}
285
286/// A controller for managing window tabs.
287#[derive(Default)]
288pub struct SystemWindowTabController {
289 visible: Option<bool>,
290 tab_groups: FxHashMap<usize, Vec<SystemWindowTab>>,
291}
292
293impl Global for SystemWindowTabController {}
294
295impl SystemWindowTabController {
296 /// Create a new instance of the window tab controller.
297 pub fn new() -> Self {
298 Self {
299 visible: None,
300 tab_groups: FxHashMap::default(),
301 }
302 }
303
304 /// Initialize the global window tab controller.
305 pub fn init(cx: &mut App) {
306 cx.set_global(SystemWindowTabController::new());
307 }
308
309 /// Get all tab groups.
310 pub fn tab_groups(&self) -> &FxHashMap<usize, Vec<SystemWindowTab>> {
311 &self.tab_groups
312 }
313
314 /// Get the next tab group window handle.
315 pub fn get_next_tab_group_window(cx: &mut App, id: WindowId) -> Option<&AnyWindowHandle> {
316 let controller = cx.global::<SystemWindowTabController>();
317 let current_group = controller
318 .tab_groups
319 .iter()
320 .find_map(|(group, tabs)| tabs.iter().find(|tab| tab.id == id).map(|_| group));
321
322 let current_group = current_group?;
323 let mut group_ids: Vec<_> = controller.tab_groups.keys().collect();
324 let idx = group_ids.iter().position(|g| *g == current_group)?;
325 let next_idx = (idx + 1) % group_ids.len();
326
327 controller
328 .tab_groups
329 .get(group_ids[next_idx])
330 .and_then(|tabs| {
331 tabs.iter()
332 .max_by_key(|tab| tab.last_active_at)
333 .or_else(|| tabs.first())
334 .map(|tab| &tab.handle)
335 })
336 }
337
338 /// Get the previous tab group window handle.
339 pub fn get_prev_tab_group_window(cx: &mut App, id: WindowId) -> Option<&AnyWindowHandle> {
340 let controller = cx.global::<SystemWindowTabController>();
341 let current_group = controller
342 .tab_groups
343 .iter()
344 .find_map(|(group, tabs)| tabs.iter().find(|tab| tab.id == id).map(|_| group));
345
346 let current_group = current_group?;
347 let mut group_ids: Vec<_> = controller.tab_groups.keys().collect();
348 let idx = group_ids.iter().position(|g| *g == current_group)?;
349 let prev_idx = if idx == 0 {
350 group_ids.len() - 1
351 } else {
352 idx - 1
353 };
354
355 controller
356 .tab_groups
357 .get(group_ids[prev_idx])
358 .and_then(|tabs| {
359 tabs.iter()
360 .max_by_key(|tab| tab.last_active_at)
361 .or_else(|| tabs.first())
362 .map(|tab| &tab.handle)
363 })
364 }
365
366 /// Get all tabs in the same window.
367 pub fn tabs(&self, id: WindowId) -> Option<&Vec<SystemWindowTab>> {
368 let tab_group = self
369 .tab_groups
370 .iter()
371 .find_map(|(group, tabs)| tabs.iter().find(|tab| tab.id == id).map(|_| *group))?;
372
373 self.tab_groups.get(&tab_group)
374 }
375
376 /// Initialize the visibility of the system window tab controller.
377 pub fn init_visible(cx: &mut App, visible: bool) {
378 let mut controller = cx.global_mut::<SystemWindowTabController>();
379 if controller.visible.is_none() {
380 controller.visible = Some(visible);
381 }
382 }
383
384 /// Get the visibility of the system window tab controller.
385 pub fn is_visible(&self) -> bool {
386 self.visible.unwrap_or(false)
387 }
388
389 /// Set the visibility of the system window tab controller.
390 pub fn set_visible(cx: &mut App, visible: bool) {
391 let mut controller = cx.global_mut::<SystemWindowTabController>();
392 controller.visible = Some(visible);
393 }
394
395 /// Update the last active of a window.
396 pub fn update_last_active(cx: &mut App, id: WindowId) {
397 let mut controller = cx.global_mut::<SystemWindowTabController>();
398 for windows in controller.tab_groups.values_mut() {
399 for tab in windows.iter_mut() {
400 if tab.id == id {
401 tab.last_active_at = Instant::now();
402 }
403 }
404 }
405 }
406
407 /// Update the position of a tab within its group.
408 pub fn update_tab_position(cx: &mut App, id: WindowId, ix: usize) {
409 let mut controller = cx.global_mut::<SystemWindowTabController>();
410 for (_, windows) in controller.tab_groups.iter_mut() {
411 if let Some(current_pos) = windows.iter().position(|tab| tab.id == id) {
412 if ix < windows.len() && current_pos != ix {
413 let window_tab = windows.remove(current_pos);
414 windows.insert(ix, window_tab);
415 }
416 break;
417 }
418 }
419 }
420
421 /// Update the title of a tab.
422 pub fn update_tab_title(cx: &mut App, id: WindowId, title: SharedString) {
423 let controller = cx.global::<SystemWindowTabController>();
424 let tab = controller
425 .tab_groups
426 .values()
427 .flat_map(|windows| windows.iter())
428 .find(|tab| tab.id == id);
429
430 if tab.map_or(true, |t| t.title == title) {
431 return;
432 }
433
434 let mut controller = cx.global_mut::<SystemWindowTabController>();
435 for windows in controller.tab_groups.values_mut() {
436 for tab in windows.iter_mut() {
437 if tab.id == id {
438 tab.title = title;
439 return;
440 }
441 }
442 }
443 }
444
445 /// Insert a tab into a tab group.
446 pub fn add_tab(cx: &mut App, id: WindowId, tabs: Vec<SystemWindowTab>) {
447 let mut controller = cx.global_mut::<SystemWindowTabController>();
448 let Some(tab) = tabs.clone().into_iter().find(|tab| tab.id == id) else {
449 return;
450 };
451
452 let mut expected_tab_ids: Vec<_> = tabs
453 .iter()
454 .filter(|tab| tab.id != id)
455 .map(|tab| tab.id)
456 .sorted()
457 .collect();
458
459 let mut tab_group_id = None;
460 for (group_id, group_tabs) in &controller.tab_groups {
461 let tab_ids: Vec<_> = group_tabs.iter().map(|tab| tab.id).sorted().collect();
462 if tab_ids == expected_tab_ids {
463 tab_group_id = Some(*group_id);
464 break;
465 }
466 }
467
468 if let Some(tab_group_id) = tab_group_id {
469 if let Some(tabs) = controller.tab_groups.get_mut(&tab_group_id) {
470 tabs.push(tab);
471 }
472 } else {
473 let new_group_id = controller.tab_groups.len();
474 controller.tab_groups.insert(new_group_id, tabs);
475 }
476 }
477
478 /// Remove a tab from a tab group.
479 pub fn remove_tab(cx: &mut App, id: WindowId) -> Option<SystemWindowTab> {
480 let mut controller = cx.global_mut::<SystemWindowTabController>();
481 let mut removed_tab = None;
482
483 controller.tab_groups.retain(|_, tabs| {
484 if let Some(pos) = tabs.iter().position(|tab| tab.id == id) {
485 removed_tab = Some(tabs.remove(pos));
486 }
487 !tabs.is_empty()
488 });
489
490 removed_tab
491 }
492
493 /// Move a tab to a new tab group.
494 pub fn move_tab_to_new_window(cx: &mut App, id: WindowId) {
495 let mut removed_tab = Self::remove_tab(cx, id);
496 let mut controller = cx.global_mut::<SystemWindowTabController>();
497
498 if let Some(tab) = removed_tab {
499 let new_group_id = controller.tab_groups.keys().max().map_or(0, |k| k + 1);
500 controller.tab_groups.insert(new_group_id, vec![tab]);
501 }
502 }
503
504 /// Merge all tab groups into a single group.
505 pub fn merge_all_windows(cx: &mut App, id: WindowId) {
506 let mut controller = cx.global_mut::<SystemWindowTabController>();
507 let Some(initial_tabs) = controller.tabs(id) else {
508 return;
509 };
510
511 let mut all_tabs = initial_tabs.clone();
512 for tabs in controller.tab_groups.values() {
513 all_tabs.extend(
514 tabs.iter()
515 .filter(|tab| !initial_tabs.contains(tab))
516 .cloned(),
517 );
518 }
519
520 controller.tab_groups.clear();
521 controller.tab_groups.insert(0, all_tabs);
522 }
523
524 /// Selects the next tab in the tab group in the trailing direction.
525 pub fn select_next_tab(cx: &mut App, id: WindowId) {
526 let mut controller = cx.global_mut::<SystemWindowTabController>();
527 let Some(tabs) = controller.tabs(id) else {
528 return;
529 };
530
531 let current_index = tabs.iter().position(|tab| tab.id == id).unwrap();
532 let next_index = (current_index + 1) % tabs.len();
533
534 let _ = &tabs[next_index].handle.update(cx, |_, window, _| {
535 window.activate_window();
536 });
537 }
538
539 /// Selects the previous tab in the tab group in the leading direction.
540 pub fn select_previous_tab(cx: &mut App, id: WindowId) {
541 let mut controller = cx.global_mut::<SystemWindowTabController>();
542 let Some(tabs) = controller.tabs(id) else {
543 return;
544 };
545
546 let current_index = tabs.iter().position(|tab| tab.id == id).unwrap();
547 let previous_index = if current_index == 0 {
548 tabs.len() - 1
549 } else {
550 current_index - 1
551 };
552
553 let _ = &tabs[previous_index].handle.update(cx, |_, window, _| {
554 window.activate_window();
555 });
556 }
557}
558
559pub(crate) enum GpuiMode {
560 #[cfg(any(test, feature = "test-support"))]
561 Test {
562 skip_drawing: bool,
563 },
564 Production,
565}
566
567impl GpuiMode {
568 #[cfg(any(test, feature = "test-support"))]
569 pub fn test() -> Self {
570 GpuiMode::Test {
571 skip_drawing: false,
572 }
573 }
574
575 #[inline]
576 pub(crate) fn skip_drawing(&self) -> bool {
577 match self {
578 #[cfg(any(test, feature = "test-support"))]
579 GpuiMode::Test { skip_drawing } => *skip_drawing,
580 GpuiMode::Production => false,
581 }
582 }
583}
584
585/// Contains the state of the full application, and passed as a reference to a variety of callbacks.
586/// Other [Context] derefs to this type.
587/// You need a reference to an `App` to access the state of a [Entity].
588pub struct App {
589 pub(crate) this: Weak<AppCell>,
590 pub(crate) platform: Rc<dyn Platform>,
591 pub(crate) mode: GpuiMode,
592 text_system: Arc<TextSystem>,
593 flushing_effects: bool,
594 pending_updates: usize,
595 pub(crate) actions: Rc<ActionRegistry>,
596 pub(crate) active_drag: Option<AnyDrag>,
597 pub(crate) background_executor: BackgroundExecutor,
598 pub(crate) foreground_executor: ForegroundExecutor,
599 pub(crate) loading_assets: FxHashMap<(TypeId, u64), Box<dyn Any>>,
600 asset_source: Arc<dyn AssetSource>,
601 pub(crate) svg_renderer: SvgRenderer,
602 http_client: Arc<dyn HttpClient>,
603 pub(crate) globals_by_type: FxHashMap<TypeId, Box<dyn Any>>,
604 pub(crate) entities: EntityMap,
605 pub(crate) window_update_stack: Vec<WindowId>,
606 pub(crate) new_entity_observers: SubscriberSet<TypeId, NewEntityListener>,
607 pub(crate) windows: SlotMap<WindowId, Option<Box<Window>>>,
608 pub(crate) window_handles: FxHashMap<WindowId, AnyWindowHandle>,
609 pub(crate) focus_handles: Arc<FocusMap>,
610 pub(crate) keymap: Rc<RefCell<Keymap>>,
611 pub(crate) keyboard_layout: Box<dyn PlatformKeyboardLayout>,
612 pub(crate) keyboard_mapper: Rc<dyn PlatformKeyboardMapper>,
613 pub(crate) global_action_listeners:
614 FxHashMap<TypeId, Vec<Rc<dyn Fn(&dyn Any, DispatchPhase, &mut Self)>>>,
615 pending_effects: VecDeque<Effect>,
616 pub(crate) pending_notifications: FxHashSet<EntityId>,
617 pub(crate) pending_global_notifications: FxHashSet<TypeId>,
618 pub(crate) observers: SubscriberSet<EntityId, Handler>,
619 // TypeId is the type of the event that the listener callback expects
620 pub(crate) event_listeners: SubscriberSet<EntityId, (TypeId, Listener)>,
621 pub(crate) keystroke_observers: SubscriberSet<(), KeystrokeObserver>,
622 pub(crate) keystroke_interceptors: SubscriberSet<(), KeystrokeObserver>,
623 pub(crate) keyboard_layout_observers: SubscriberSet<(), Handler>,
624 pub(crate) release_listeners: SubscriberSet<EntityId, ReleaseListener>,
625 pub(crate) global_observers: SubscriberSet<TypeId, Handler>,
626 pub(crate) quit_observers: SubscriberSet<(), QuitHandler>,
627 pub(crate) restart_observers: SubscriberSet<(), Handler>,
628 pub(crate) restart_path: Option<PathBuf>,
629 pub(crate) window_closed_observers: SubscriberSet<(), WindowClosedHandler>,
630 pub(crate) layout_id_buffer: Vec<LayoutId>, // We recycle this memory across layout requests.
631 pub(crate) propagate_event: bool,
632 pub(crate) prompt_builder: Option<PromptBuilder>,
633 pub(crate) window_invalidators_by_entity:
634 FxHashMap<EntityId, FxHashMap<WindowId, WindowInvalidator>>,
635 pub(crate) tracked_entities: FxHashMap<WindowId, FxHashSet<EntityId>>,
636 #[cfg(any(feature = "inspector", debug_assertions))]
637 pub(crate) inspector_renderer: Option<crate::InspectorRenderer>,
638 #[cfg(any(feature = "inspector", debug_assertions))]
639 pub(crate) inspector_element_registry: InspectorElementRegistry,
640 #[cfg(any(test, feature = "test-support", debug_assertions))]
641 pub(crate) name: Option<&'static str>,
642 quit_mode: QuitMode,
643 quitting: bool,
644}
645
646impl App {
647 #[allow(clippy::new_ret_no_self)]
648 pub(crate) fn new_app(
649 platform: Rc<dyn Platform>,
650 asset_source: Arc<dyn AssetSource>,
651 http_client: Arc<dyn HttpClient>,
652 ) -> Rc<AppCell> {
653 let executor = platform.background_executor();
654 let foreground_executor = platform.foreground_executor();
655 assert!(
656 executor.is_main_thread(),
657 "must construct App on main thread"
658 );
659
660 let text_system = Arc::new(TextSystem::new(platform.text_system()));
661 let entities = EntityMap::new();
662 let keyboard_layout = platform.keyboard_layout();
663 let keyboard_mapper = platform.keyboard_mapper();
664
665 let app = Rc::new_cyclic(|this| AppCell {
666 app: RefCell::new(App {
667 this: this.clone(),
668 platform: platform.clone(),
669 text_system,
670 mode: GpuiMode::Production,
671 actions: Rc::new(ActionRegistry::default()),
672 flushing_effects: false,
673 pending_updates: 0,
674 active_drag: None,
675 background_executor: executor,
676 foreground_executor,
677 svg_renderer: SvgRenderer::new(asset_source.clone()),
678 loading_assets: Default::default(),
679 asset_source,
680 http_client,
681 globals_by_type: FxHashMap::default(),
682 entities,
683 new_entity_observers: SubscriberSet::new(),
684 windows: SlotMap::with_key(),
685 window_update_stack: Vec::new(),
686 window_handles: FxHashMap::default(),
687 focus_handles: Arc::new(RwLock::new(SlotMap::with_key())),
688 keymap: Rc::new(RefCell::new(Keymap::default())),
689 keyboard_layout,
690 keyboard_mapper,
691 global_action_listeners: FxHashMap::default(),
692 pending_effects: VecDeque::new(),
693 pending_notifications: FxHashSet::default(),
694 pending_global_notifications: FxHashSet::default(),
695 observers: SubscriberSet::new(),
696 tracked_entities: FxHashMap::default(),
697 window_invalidators_by_entity: FxHashMap::default(),
698 event_listeners: SubscriberSet::new(),
699 release_listeners: SubscriberSet::new(),
700 keystroke_observers: SubscriberSet::new(),
701 keystroke_interceptors: SubscriberSet::new(),
702 keyboard_layout_observers: SubscriberSet::new(),
703 global_observers: SubscriberSet::new(),
704 quit_observers: SubscriberSet::new(),
705 restart_observers: SubscriberSet::new(),
706 restart_path: None,
707 window_closed_observers: SubscriberSet::new(),
708 layout_id_buffer: Default::default(),
709 propagate_event: true,
710 prompt_builder: Some(PromptBuilder::Default),
711 #[cfg(any(feature = "inspector", debug_assertions))]
712 inspector_renderer: None,
713 #[cfg(any(feature = "inspector", debug_assertions))]
714 inspector_element_registry: InspectorElementRegistry::default(),
715 quit_mode: QuitMode::default(),
716 quitting: false,
717
718 #[cfg(any(test, feature = "test-support", debug_assertions))]
719 name: None,
720 }),
721 });
722
723 init_app_menus(platform.as_ref(), &app.borrow());
724 SystemWindowTabController::init(&mut app.borrow_mut());
725
726 platform.on_keyboard_layout_change(Box::new({
727 let app = Rc::downgrade(&app);
728 move || {
729 if let Some(app) = app.upgrade() {
730 let cx = &mut app.borrow_mut();
731 cx.keyboard_layout = cx.platform.keyboard_layout();
732 cx.keyboard_mapper = cx.platform.keyboard_mapper();
733 cx.keyboard_layout_observers
734 .clone()
735 .retain(&(), move |callback| (callback)(cx));
736 }
737 }
738 }));
739
740 platform.on_quit(Box::new({
741 let cx = app.clone();
742 move || {
743 cx.borrow_mut().shutdown();
744 }
745 }));
746
747 app
748 }
749
750 /// Quit the application gracefully. Handlers registered with [`Context::on_app_quit`]
751 /// will be given 100ms to complete before exiting.
752 pub fn shutdown(&mut self) {
753 let mut futures = Vec::new();
754
755 for observer in self.quit_observers.remove(&()) {
756 futures.push(observer(self));
757 }
758
759 self.windows.clear();
760 self.window_handles.clear();
761 self.flush_effects();
762 self.quitting = true;
763
764 let futures = futures::future::join_all(futures);
765 if self
766 .background_executor
767 .block_with_timeout(SHUTDOWN_TIMEOUT, futures)
768 .is_err()
769 {
770 log::error!("timed out waiting on app_will_quit");
771 }
772
773 self.quitting = false;
774 }
775
776 /// Get the id of the current keyboard layout
777 pub fn keyboard_layout(&self) -> &dyn PlatformKeyboardLayout {
778 self.keyboard_layout.as_ref()
779 }
780
781 /// Get the current keyboard mapper.
782 pub fn keyboard_mapper(&self) -> &Rc<dyn PlatformKeyboardMapper> {
783 &self.keyboard_mapper
784 }
785
786 /// Invokes a handler when the current keyboard layout changes
787 pub fn on_keyboard_layout_change<F>(&self, mut callback: F) -> Subscription
788 where
789 F: 'static + FnMut(&mut App),
790 {
791 let (subscription, activate) = self.keyboard_layout_observers.insert(
792 (),
793 Box::new(move |cx| {
794 callback(cx);
795 true
796 }),
797 );
798 activate();
799 subscription
800 }
801
802 /// Gracefully quit the application via the platform's standard routine.
803 pub fn quit(&self) {
804 self.platform.quit();
805 }
806
807 /// Schedules all windows in the application to be redrawn. This can be called
808 /// multiple times in an update cycle and still result in a single redraw.
809 pub fn refresh_windows(&mut self) {
810 self.pending_effects.push_back(Effect::RefreshWindows);
811 }
812
813 pub(crate) fn update<R>(&mut self, update: impl FnOnce(&mut Self) -> R) -> R {
814 self.start_update();
815 let result = update(self);
816 self.finish_update();
817 result
818 }
819
820 pub(crate) fn start_update(&mut self) {
821 self.pending_updates += 1;
822 }
823
824 pub(crate) fn finish_update(&mut self) {
825 if !self.flushing_effects && self.pending_updates == 1 {
826 self.flushing_effects = true;
827 self.flush_effects();
828 self.flushing_effects = false;
829 }
830 self.pending_updates -= 1;
831 }
832
833 /// Arrange a callback to be invoked when the given entity calls `notify` on its respective context.
834 pub fn observe<W>(
835 &mut self,
836 entity: &Entity<W>,
837 mut on_notify: impl FnMut(Entity<W>, &mut App) + 'static,
838 ) -> Subscription
839 where
840 W: 'static,
841 {
842 self.observe_internal(entity, move |e, cx| {
843 on_notify(e, cx);
844 true
845 })
846 }
847
848 pub(crate) fn detect_accessed_entities<R>(
849 &mut self,
850 callback: impl FnOnce(&mut App) -> R,
851 ) -> (R, FxHashSet<EntityId>) {
852 let accessed_entities_start = self.entities.accessed_entities.borrow().clone();
853 let result = callback(self);
854 let accessed_entities_end = self.entities.accessed_entities.borrow().clone();
855 let entities_accessed_in_callback = accessed_entities_end
856 .difference(&accessed_entities_start)
857 .copied()
858 .collect::<FxHashSet<EntityId>>();
859 (result, entities_accessed_in_callback)
860 }
861
862 pub(crate) fn record_entities_accessed(
863 &mut self,
864 window_handle: AnyWindowHandle,
865 invalidator: WindowInvalidator,
866 entities: &FxHashSet<EntityId>,
867 ) {
868 let mut tracked_entities =
869 std::mem::take(self.tracked_entities.entry(window_handle.id).or_default());
870 for entity in tracked_entities.iter() {
871 self.window_invalidators_by_entity
872 .entry(*entity)
873 .and_modify(|windows| {
874 windows.remove(&window_handle.id);
875 });
876 }
877 for entity in entities.iter() {
878 self.window_invalidators_by_entity
879 .entry(*entity)
880 .or_default()
881 .insert(window_handle.id, invalidator.clone());
882 }
883 tracked_entities.clear();
884 tracked_entities.extend(entities.iter().copied());
885 self.tracked_entities
886 .insert(window_handle.id, tracked_entities);
887 }
888
889 pub(crate) fn new_observer(&mut self, key: EntityId, value: Handler) -> Subscription {
890 let (subscription, activate) = self.observers.insert(key, value);
891 self.defer(move |_| activate());
892 subscription
893 }
894
895 pub(crate) fn observe_internal<W>(
896 &mut self,
897 entity: &Entity<W>,
898 mut on_notify: impl FnMut(Entity<W>, &mut App) -> bool + 'static,
899 ) -> Subscription
900 where
901 W: 'static,
902 {
903 let entity_id = entity.entity_id();
904 let handle = entity.downgrade();
905 self.new_observer(
906 entity_id,
907 Box::new(move |cx| {
908 if let Some(entity) = handle.upgrade() {
909 on_notify(entity, cx)
910 } else {
911 false
912 }
913 }),
914 )
915 }
916
917 /// Arrange for the given callback to be invoked whenever the given entity emits an event of a given type.
918 /// The callback is provided a handle to the emitting entity and a reference to the emitted event.
919 pub fn subscribe<T, Event>(
920 &mut self,
921 entity: &Entity<T>,
922 mut on_event: impl FnMut(Entity<T>, &Event, &mut App) + 'static,
923 ) -> Subscription
924 where
925 T: 'static + EventEmitter<Event>,
926 Event: 'static,
927 {
928 self.subscribe_internal(entity, move |entity, event, cx| {
929 on_event(entity, event, cx);
930 true
931 })
932 }
933
934 pub(crate) fn new_subscription(
935 &mut self,
936 key: EntityId,
937 value: (TypeId, Listener),
938 ) -> Subscription {
939 let (subscription, activate) = self.event_listeners.insert(key, value);
940 self.defer(move |_| activate());
941 subscription
942 }
943 pub(crate) fn subscribe_internal<T, Evt>(
944 &mut self,
945 entity: &Entity<T>,
946 mut on_event: impl FnMut(Entity<T>, &Evt, &mut App) -> bool + 'static,
947 ) -> Subscription
948 where
949 T: 'static + EventEmitter<Evt>,
950 Evt: 'static,
951 {
952 let entity_id = entity.entity_id();
953 let handle = entity.downgrade();
954 self.new_subscription(
955 entity_id,
956 (
957 TypeId::of::<Evt>(),
958 Box::new(move |event, cx| {
959 let event: &Evt = event.downcast_ref().expect("invalid event type");
960 if let Some(entity) = handle.upgrade() {
961 on_event(entity, event, cx)
962 } else {
963 false
964 }
965 }),
966 ),
967 )
968 }
969
970 /// Returns handles to all open windows in the application.
971 /// Each handle could be downcast to a handle typed for the root view of that window.
972 /// To find all windows of a given type, you could filter on
973 pub fn windows(&self) -> Vec<AnyWindowHandle> {
974 self.windows
975 .keys()
976 .flat_map(|window_id| self.window_handles.get(&window_id).copied())
977 .collect()
978 }
979
980 /// Returns the window handles ordered by their appearance on screen, front to back.
981 ///
982 /// The first window in the returned list is the active/topmost window of the application.
983 ///
984 /// This method returns None if the platform doesn't implement the method yet.
985 pub fn window_stack(&self) -> Option<Vec<AnyWindowHandle>> {
986 self.platform.window_stack()
987 }
988
989 /// Returns a handle to the window that is currently focused at the platform level, if one exists.
990 pub fn active_window(&self) -> Option<AnyWindowHandle> {
991 self.platform.active_window()
992 }
993
994 /// Opens a new window with the given option and the root view returned by the given function.
995 /// The function is invoked with a `Window`, which can be used to interact with window-specific
996 /// functionality.
997 pub fn open_window<V: 'static + Render>(
998 &mut self,
999 options: crate::WindowOptions,
1000 build_root_view: impl FnOnce(&mut Window, &mut App) -> Entity<V>,
1001 ) -> anyhow::Result<WindowHandle<V>> {
1002 self.update(|cx| {
1003 let id = cx.windows.insert(None);
1004 let handle = WindowHandle::new(id);
1005 match Window::new(handle.into(), options, cx) {
1006 Ok(mut window) => {
1007 cx.window_update_stack.push(id);
1008 let root_view = build_root_view(&mut window, cx);
1009 cx.window_update_stack.pop();
1010 window.root.replace(root_view.into());
1011 window.defer(cx, |window: &mut Window, cx| window.appearance_changed(cx));
1012
1013 // allow a window to draw at least once before returning
1014 // this didn't cause any issues on non windows platforms as it seems we always won the race to on_request_frame
1015 // on windows we quite frequently lose the race and return a window that has never rendered, which leads to a crash
1016 // where DispatchTree::root_node_id asserts on empty nodes
1017 let clear = window.draw(cx);
1018 clear.clear();
1019
1020 cx.window_handles.insert(id, window.handle);
1021 cx.windows.get_mut(id).unwrap().replace(Box::new(window));
1022 Ok(handle)
1023 }
1024 Err(e) => {
1025 cx.windows.remove(id);
1026 Err(e)
1027 }
1028 }
1029 })
1030 }
1031
1032 /// Instructs the platform to activate the application by bringing it to the foreground.
1033 pub fn activate(&self, ignoring_other_apps: bool) {
1034 self.platform.activate(ignoring_other_apps);
1035 }
1036
1037 /// Hide the application at the platform level.
1038 pub fn hide(&self) {
1039 self.platform.hide();
1040 }
1041
1042 /// Hide other applications at the platform level.
1043 pub fn hide_other_apps(&self) {
1044 self.platform.hide_other_apps();
1045 }
1046
1047 /// Unhide other applications at the platform level.
1048 pub fn unhide_other_apps(&self) {
1049 self.platform.unhide_other_apps();
1050 }
1051
1052 /// Returns the list of currently active displays.
1053 pub fn displays(&self) -> Vec<Rc<dyn PlatformDisplay>> {
1054 self.platform.displays()
1055 }
1056
1057 /// Returns the primary display that will be used for new windows.
1058 pub fn primary_display(&self) -> Option<Rc<dyn PlatformDisplay>> {
1059 self.platform.primary_display()
1060 }
1061
1062 /// Returns whether `screen_capture_sources` may work.
1063 pub fn is_screen_capture_supported(&self) -> bool {
1064 self.platform.is_screen_capture_supported()
1065 }
1066
1067 /// Returns a list of available screen capture sources.
1068 pub fn screen_capture_sources(
1069 &self,
1070 ) -> oneshot::Receiver<Result<Vec<Rc<dyn ScreenCaptureSource>>>> {
1071 self.platform.screen_capture_sources()
1072 }
1073
1074 /// Returns the display with the given ID, if one exists.
1075 pub fn find_display(&self, id: DisplayId) -> Option<Rc<dyn PlatformDisplay>> {
1076 self.displays()
1077 .iter()
1078 .find(|display| display.id() == id)
1079 .cloned()
1080 }
1081
1082 /// Returns the appearance of the application's windows.
1083 pub fn window_appearance(&self) -> WindowAppearance {
1084 self.platform.window_appearance()
1085 }
1086
1087 /// Writes data to the primary selection buffer.
1088 /// Only available on Linux.
1089 #[cfg(any(target_os = "linux", target_os = "freebsd"))]
1090 pub fn write_to_primary(&self, item: ClipboardItem) {
1091 self.platform.write_to_primary(item)
1092 }
1093
1094 /// Writes data to the platform clipboard.
1095 pub fn write_to_clipboard(&self, item: ClipboardItem) {
1096 self.platform.write_to_clipboard(item)
1097 }
1098
1099 /// Reads data from the primary selection buffer.
1100 /// Only available on Linux.
1101 #[cfg(any(target_os = "linux", target_os = "freebsd"))]
1102 pub fn read_from_primary(&self) -> Option<ClipboardItem> {
1103 self.platform.read_from_primary()
1104 }
1105
1106 /// Reads data from the platform clipboard.
1107 pub fn read_from_clipboard(&self) -> Option<ClipboardItem> {
1108 self.platform.read_from_clipboard()
1109 }
1110
1111 /// Writes credentials to the platform keychain.
1112 pub fn write_credentials(
1113 &self,
1114 url: &str,
1115 username: &str,
1116 password: &[u8],
1117 ) -> Task<Result<()>> {
1118 self.platform.write_credentials(url, username, password)
1119 }
1120
1121 /// Reads credentials from the platform keychain.
1122 pub fn read_credentials(&self, url: &str) -> Task<Result<Option<(String, Vec<u8>)>>> {
1123 self.platform.read_credentials(url)
1124 }
1125
1126 /// Deletes credentials from the platform keychain.
1127 pub fn delete_credentials(&self, url: &str) -> Task<Result<()>> {
1128 self.platform.delete_credentials(url)
1129 }
1130
1131 /// Directs the platform's default browser to open the given URL.
1132 pub fn open_url(&self, url: &str) {
1133 self.platform.open_url(url);
1134 }
1135
1136 /// Registers the given URL scheme (e.g. `zed` for `zed://` urls) to be
1137 /// opened by the current app.
1138 ///
1139 /// On some platforms (e.g. macOS) you may be able to register URL schemes
1140 /// as part of app distribution, but this method exists to let you register
1141 /// schemes at runtime.
1142 pub fn register_url_scheme(&self, scheme: &str) -> Task<Result<()>> {
1143 self.platform.register_url_scheme(scheme)
1144 }
1145
1146 /// Returns the full pathname of the current app bundle.
1147 ///
1148 /// Returns an error if the app is not being run from a bundle.
1149 pub fn app_path(&self) -> Result<PathBuf> {
1150 self.platform.app_path()
1151 }
1152
1153 /// On Linux, returns the name of the compositor in use.
1154 ///
1155 /// Returns an empty string on other platforms.
1156 pub fn compositor_name(&self) -> &'static str {
1157 self.platform.compositor_name()
1158 }
1159
1160 /// Returns the file URL of the executable with the specified name in the application bundle
1161 pub fn path_for_auxiliary_executable(&self, name: &str) -> Result<PathBuf> {
1162 self.platform.path_for_auxiliary_executable(name)
1163 }
1164
1165 /// Displays a platform modal for selecting paths.
1166 ///
1167 /// When one or more paths are selected, they'll be relayed asynchronously via the returned oneshot channel.
1168 /// If cancelled, a `None` will be relayed instead.
1169 /// May return an error on Linux if the file picker couldn't be opened.
1170 pub fn prompt_for_paths(
1171 &self,
1172 options: PathPromptOptions,
1173 ) -> oneshot::Receiver<Result<Option<Vec<PathBuf>>>> {
1174 self.platform.prompt_for_paths(options)
1175 }
1176
1177 /// Displays a platform modal for selecting a new path where a file can be saved.
1178 ///
1179 /// The provided directory will be used to set the initial location.
1180 /// When a path is selected, it is relayed asynchronously via the returned oneshot channel.
1181 /// If cancelled, a `None` will be relayed instead.
1182 /// May return an error on Linux if the file picker couldn't be opened.
1183 pub fn prompt_for_new_path(
1184 &self,
1185 directory: &Path,
1186 suggested_name: Option<&str>,
1187 ) -> oneshot::Receiver<Result<Option<PathBuf>>> {
1188 self.platform.prompt_for_new_path(directory, suggested_name)
1189 }
1190
1191 /// Reveals the specified path at the platform level, such as in Finder on macOS.
1192 pub fn reveal_path(&self, path: &Path) {
1193 self.platform.reveal_path(path)
1194 }
1195
1196 /// Opens the specified path with the system's default application.
1197 pub fn open_with_system(&self, path: &Path) {
1198 self.platform.open_with_system(path)
1199 }
1200
1201 /// Returns whether the user has configured scrollbars to auto-hide at the platform level.
1202 pub fn should_auto_hide_scrollbars(&self) -> bool {
1203 self.platform.should_auto_hide_scrollbars()
1204 }
1205
1206 /// Restarts the application.
1207 pub fn restart(&mut self) {
1208 self.restart_observers
1209 .clone()
1210 .retain(&(), |observer| observer(self));
1211 self.platform.restart(self.restart_path.take())
1212 }
1213
1214 /// Sets the path to use when restarting the application.
1215 pub fn set_restart_path(&mut self, path: PathBuf) {
1216 self.restart_path = Some(path);
1217 }
1218
1219 /// Returns the HTTP client for the application.
1220 pub fn http_client(&self) -> Arc<dyn HttpClient> {
1221 self.http_client.clone()
1222 }
1223
1224 /// Sets the HTTP client for the application.
1225 pub fn set_http_client(&mut self, new_client: Arc<dyn HttpClient>) {
1226 self.http_client = new_client;
1227 }
1228
1229 /// Configures when the application should automatically quit.
1230 /// By default, [`QuitMode::Default`] is used.
1231 pub fn set_quit_mode(&mut self, mode: QuitMode) {
1232 self.quit_mode = mode;
1233 }
1234
1235 /// Returns the SVG renderer used by the application.
1236 pub fn svg_renderer(&self) -> SvgRenderer {
1237 self.svg_renderer.clone()
1238 }
1239
1240 pub(crate) fn push_effect(&mut self, effect: Effect) {
1241 match &effect {
1242 Effect::Notify { emitter } => {
1243 if !self.pending_notifications.insert(*emitter) {
1244 return;
1245 }
1246 }
1247 Effect::NotifyGlobalObservers { global_type } => {
1248 if !self.pending_global_notifications.insert(*global_type) {
1249 return;
1250 }
1251 }
1252 _ => {}
1253 };
1254
1255 self.pending_effects.push_back(effect);
1256 }
1257
1258 /// Called at the end of [`App::update`] to complete any side effects
1259 /// such as notifying observers, emitting events, etc. Effects can themselves
1260 /// cause effects, so we continue looping until all effects are processed.
1261 fn flush_effects(&mut self) {
1262 loop {
1263 self.release_dropped_entities();
1264 self.release_dropped_focus_handles();
1265 if let Some(effect) = self.pending_effects.pop_front() {
1266 match effect {
1267 Effect::Notify { emitter } => {
1268 self.apply_notify_effect(emitter);
1269 }
1270
1271 Effect::Emit {
1272 emitter,
1273 event_type,
1274 event,
1275 } => self.apply_emit_effect(emitter, event_type, event),
1276
1277 Effect::RefreshWindows => {
1278 self.apply_refresh_effect();
1279 }
1280
1281 Effect::NotifyGlobalObservers { global_type } => {
1282 self.apply_notify_global_observers_effect(global_type);
1283 }
1284
1285 Effect::Defer { callback } => {
1286 self.apply_defer_effect(callback);
1287 }
1288 Effect::EntityCreated {
1289 entity,
1290 tid,
1291 window,
1292 } => {
1293 self.apply_entity_created_effect(entity, tid, window);
1294 }
1295 }
1296 } else {
1297 #[cfg(any(test, feature = "test-support"))]
1298 for window in self
1299 .windows
1300 .values()
1301 .filter_map(|window| {
1302 let window = window.as_deref()?;
1303 window.invalidator.is_dirty().then_some(window.handle)
1304 })
1305 .collect::<Vec<_>>()
1306 {
1307 self.update_window(window, |_, window, cx| window.draw(cx).clear())
1308 .unwrap();
1309 }
1310
1311 if self.pending_effects.is_empty() {
1312 break;
1313 }
1314 }
1315 }
1316 }
1317
1318 /// Repeatedly called during `flush_effects` to release any entities whose
1319 /// reference count has become zero. We invoke any release observers before dropping
1320 /// each entity.
1321 fn release_dropped_entities(&mut self) {
1322 loop {
1323 let dropped = self.entities.take_dropped();
1324 if dropped.is_empty() {
1325 break;
1326 }
1327
1328 for (entity_id, mut entity) in dropped {
1329 self.observers.remove(&entity_id);
1330 self.event_listeners.remove(&entity_id);
1331 for release_callback in self.release_listeners.remove(&entity_id) {
1332 release_callback(entity.as_mut(), self);
1333 }
1334 }
1335 }
1336 }
1337
1338 /// Repeatedly called during `flush_effects` to handle a focused handle being dropped.
1339 fn release_dropped_focus_handles(&mut self) {
1340 self.focus_handles
1341 .clone()
1342 .write()
1343 .retain(|handle_id, focus| {
1344 if focus.ref_count.load(SeqCst) == 0 {
1345 for window_handle in self.windows() {
1346 window_handle
1347 .update(self, |_, window, _| {
1348 if window.focus == Some(handle_id) {
1349 window.blur();
1350 }
1351 })
1352 .unwrap();
1353 }
1354 false
1355 } else {
1356 true
1357 }
1358 });
1359 }
1360
1361 fn apply_notify_effect(&mut self, emitter: EntityId) {
1362 self.pending_notifications.remove(&emitter);
1363
1364 self.observers
1365 .clone()
1366 .retain(&emitter, |handler| handler(self));
1367 }
1368
1369 fn apply_emit_effect(&mut self, emitter: EntityId, event_type: TypeId, event: Box<dyn Any>) {
1370 self.event_listeners
1371 .clone()
1372 .retain(&emitter, |(stored_type, handler)| {
1373 if *stored_type == event_type {
1374 handler(event.as_ref(), self)
1375 } else {
1376 true
1377 }
1378 });
1379 }
1380
1381 fn apply_refresh_effect(&mut self) {
1382 for window in self.windows.values_mut() {
1383 if let Some(window) = window.as_deref_mut() {
1384 window.refreshing = true;
1385 window.invalidator.set_dirty(true);
1386 }
1387 }
1388 }
1389
1390 fn apply_notify_global_observers_effect(&mut self, type_id: TypeId) {
1391 self.pending_global_notifications.remove(&type_id);
1392 self.global_observers
1393 .clone()
1394 .retain(&type_id, |observer| observer(self));
1395 }
1396
1397 fn apply_defer_effect(&mut self, callback: Box<dyn FnOnce(&mut Self) + 'static>) {
1398 callback(self);
1399 }
1400
1401 fn apply_entity_created_effect(
1402 &mut self,
1403 entity: AnyEntity,
1404 tid: TypeId,
1405 window: Option<WindowId>,
1406 ) {
1407 self.new_entity_observers.clone().retain(&tid, |observer| {
1408 if let Some(id) = window {
1409 self.update_window_id(id, {
1410 let entity = entity.clone();
1411 |_, window, cx| (observer)(entity, &mut Some(window), cx)
1412 })
1413 .expect("All windows should be off the stack when flushing effects");
1414 } else {
1415 (observer)(entity.clone(), &mut None, self)
1416 }
1417 true
1418 });
1419 }
1420
1421 fn update_window_id<T, F>(&mut self, id: WindowId, update: F) -> Result<T>
1422 where
1423 F: FnOnce(AnyView, &mut Window, &mut App) -> T,
1424 {
1425 self.update(|cx| {
1426 let mut window = cx.windows.get_mut(id)?.take()?;
1427
1428 let root_view = window.root.clone().unwrap();
1429
1430 cx.window_update_stack.push(window.handle.id);
1431 let result = update(root_view, &mut window, cx);
1432 cx.window_update_stack.pop();
1433
1434 if window.removed {
1435 cx.window_handles.remove(&id);
1436 cx.windows.remove(id);
1437
1438 cx.window_closed_observers.clone().retain(&(), |callback| {
1439 callback(cx);
1440 true
1441 });
1442
1443 let quit_on_empty = match cx.quit_mode {
1444 QuitMode::Explicit => false,
1445 QuitMode::LastWindowClosed => true,
1446 QuitMode::Default => cfg!(not(target_os = "macos")),
1447 };
1448
1449 if quit_on_empty && cx.windows.is_empty() {
1450 cx.quit();
1451 }
1452 } else {
1453 cx.windows.get_mut(id)?.replace(window);
1454 }
1455
1456 Some(result)
1457 })
1458 .context("window not found")
1459 }
1460
1461 /// Creates an `AsyncApp`, which can be cloned and has a static lifetime
1462 /// so it can be held across `await` points.
1463 pub fn to_async(&self) -> AsyncApp {
1464 AsyncApp {
1465 app: self.this.clone(),
1466 background_executor: self.background_executor.clone(),
1467 foreground_executor: self.foreground_executor.clone(),
1468 }
1469 }
1470
1471 /// Obtains a reference to the executor, which can be used to spawn futures.
1472 pub fn background_executor(&self) -> &BackgroundExecutor {
1473 &self.background_executor
1474 }
1475
1476 /// Obtains a reference to the executor, which can be used to spawn futures.
1477 pub fn foreground_executor(&self) -> &ForegroundExecutor {
1478 if self.quitting {
1479 panic!("Can't spawn on main thread after on_app_quit")
1480 };
1481 &self.foreground_executor
1482 }
1483
1484 /// Spawns the future returned by the given function on the main thread. The closure will be invoked
1485 /// with [AsyncApp], which allows the application state to be accessed across await points.
1486 #[track_caller]
1487 pub fn spawn<AsyncFn, R>(&self, f: AsyncFn) -> Task<R>
1488 where
1489 AsyncFn: AsyncFnOnce(&mut AsyncApp) -> R + 'static,
1490 R: 'static,
1491 {
1492 if self.quitting {
1493 debug_panic!("Can't spawn on main thread after on_app_quit")
1494 };
1495
1496 let mut cx = self.to_async();
1497
1498 self.foreground_executor
1499 .spawn(async move { f(&mut cx).await })
1500 }
1501
1502 /// Spawns the future returned by the given function on the main thread with
1503 /// the given priority. The closure will be invoked with [AsyncApp], which
1504 /// allows the application state to be accessed across await points.
1505 pub fn spawn_with_priority<AsyncFn, R>(&self, priority: Priority, f: AsyncFn) -> Task<R>
1506 where
1507 AsyncFn: AsyncFnOnce(&mut AsyncApp) -> R + 'static,
1508 R: 'static,
1509 {
1510 if self.quitting {
1511 debug_panic!("Can't spawn on main thread after on_app_quit")
1512 };
1513
1514 let mut cx = self.to_async();
1515
1516 self.foreground_executor
1517 .spawn_with_priority(priority, async move { f(&mut cx).await })
1518 }
1519
1520 /// Schedules the given function to be run at the end of the current effect cycle, allowing entities
1521 /// that are currently on the stack to be returned to the app.
1522 pub fn defer(&mut self, f: impl FnOnce(&mut App) + 'static) {
1523 self.push_effect(Effect::Defer {
1524 callback: Box::new(f),
1525 });
1526 }
1527
1528 /// Accessor for the application's asset source, which is provided when constructing the `App`.
1529 pub fn asset_source(&self) -> &Arc<dyn AssetSource> {
1530 &self.asset_source
1531 }
1532
1533 /// Accessor for the text system.
1534 pub fn text_system(&self) -> &Arc<TextSystem> {
1535 &self.text_system
1536 }
1537
1538 /// Check whether a global of the given type has been assigned.
1539 pub fn has_global<G: Global>(&self) -> bool {
1540 self.globals_by_type.contains_key(&TypeId::of::<G>())
1541 }
1542
1543 /// Access the global of the given type. Panics if a global for that type has not been assigned.
1544 #[track_caller]
1545 pub fn global<G: Global>(&self) -> &G {
1546 self.globals_by_type
1547 .get(&TypeId::of::<G>())
1548 .map(|any_state| any_state.downcast_ref::<G>().unwrap())
1549 .with_context(|| format!("no state of type {} exists", type_name::<G>()))
1550 .unwrap()
1551 }
1552
1553 /// Access the global of the given type if a value has been assigned.
1554 pub fn try_global<G: Global>(&self) -> Option<&G> {
1555 self.globals_by_type
1556 .get(&TypeId::of::<G>())
1557 .map(|any_state| any_state.downcast_ref::<G>().unwrap())
1558 }
1559
1560 /// Access the global of the given type mutably. Panics if a global for that type has not been assigned.
1561 #[track_caller]
1562 pub fn global_mut<G: Global>(&mut self) -> &mut G {
1563 let global_type = TypeId::of::<G>();
1564 self.push_effect(Effect::NotifyGlobalObservers { global_type });
1565 self.globals_by_type
1566 .get_mut(&global_type)
1567 .and_then(|any_state| any_state.downcast_mut::<G>())
1568 .with_context(|| format!("no state of type {} exists", type_name::<G>()))
1569 .unwrap()
1570 }
1571
1572 /// Access the global of the given type mutably. A default value is assigned if a global of this type has not
1573 /// yet been assigned.
1574 pub fn default_global<G: Global + Default>(&mut self) -> &mut G {
1575 let global_type = TypeId::of::<G>();
1576 self.push_effect(Effect::NotifyGlobalObservers { global_type });
1577 self.globals_by_type
1578 .entry(global_type)
1579 .or_insert_with(|| Box::<G>::default())
1580 .downcast_mut::<G>()
1581 .unwrap()
1582 }
1583
1584 /// Sets the value of the global of the given type.
1585 pub fn set_global<G: Global>(&mut self, global: G) {
1586 let global_type = TypeId::of::<G>();
1587 self.push_effect(Effect::NotifyGlobalObservers { global_type });
1588 self.globals_by_type.insert(global_type, Box::new(global));
1589 }
1590
1591 /// Clear all stored globals. Does not notify global observers.
1592 #[cfg(any(test, feature = "test-support"))]
1593 pub fn clear_globals(&mut self) {
1594 self.globals_by_type.drain();
1595 }
1596
1597 /// Remove the global of the given type from the app context. Does not notify global observers.
1598 pub fn remove_global<G: Global>(&mut self) -> G {
1599 let global_type = TypeId::of::<G>();
1600 self.push_effect(Effect::NotifyGlobalObservers { global_type });
1601 *self
1602 .globals_by_type
1603 .remove(&global_type)
1604 .unwrap_or_else(|| panic!("no global added for {}", std::any::type_name::<G>()))
1605 .downcast()
1606 .unwrap()
1607 }
1608
1609 /// Register a callback to be invoked when a global of the given type is updated.
1610 pub fn observe_global<G: Global>(
1611 &mut self,
1612 mut f: impl FnMut(&mut Self) + 'static,
1613 ) -> Subscription {
1614 let (subscription, activate) = self.global_observers.insert(
1615 TypeId::of::<G>(),
1616 Box::new(move |cx| {
1617 f(cx);
1618 true
1619 }),
1620 );
1621 self.defer(move |_| activate());
1622 subscription
1623 }
1624
1625 /// Move the global of the given type to the stack.
1626 #[track_caller]
1627 pub(crate) fn lease_global<G: Global>(&mut self) -> GlobalLease<G> {
1628 GlobalLease::new(
1629 self.globals_by_type
1630 .remove(&TypeId::of::<G>())
1631 .with_context(|| format!("no global registered of type {}", type_name::<G>()))
1632 .unwrap(),
1633 )
1634 }
1635
1636 /// Restore the global of the given type after it is moved to the stack.
1637 pub(crate) fn end_global_lease<G: Global>(&mut self, lease: GlobalLease<G>) {
1638 let global_type = TypeId::of::<G>();
1639
1640 self.push_effect(Effect::NotifyGlobalObservers { global_type });
1641 self.globals_by_type.insert(global_type, lease.global);
1642 }
1643
1644 pub(crate) fn new_entity_observer(
1645 &self,
1646 key: TypeId,
1647 value: NewEntityListener,
1648 ) -> Subscription {
1649 let (subscription, activate) = self.new_entity_observers.insert(key, value);
1650 activate();
1651 subscription
1652 }
1653
1654 /// Arrange for the given function to be invoked whenever a view of the specified type is created.
1655 /// The function will be passed a mutable reference to the view along with an appropriate context.
1656 pub fn observe_new<T: 'static>(
1657 &self,
1658 on_new: impl 'static + Fn(&mut T, Option<&mut Window>, &mut Context<T>),
1659 ) -> Subscription {
1660 self.new_entity_observer(
1661 TypeId::of::<T>(),
1662 Box::new(
1663 move |any_entity: AnyEntity, window: &mut Option<&mut Window>, cx: &mut App| {
1664 any_entity
1665 .downcast::<T>()
1666 .unwrap()
1667 .update(cx, |entity_state, cx| {
1668 on_new(entity_state, window.as_deref_mut(), cx)
1669 })
1670 },
1671 ),
1672 )
1673 }
1674
1675 /// Observe the release of a entity. The callback is invoked after the entity
1676 /// has no more strong references but before it has been dropped.
1677 pub fn observe_release<T>(
1678 &self,
1679 handle: &Entity<T>,
1680 on_release: impl FnOnce(&mut T, &mut App) + 'static,
1681 ) -> Subscription
1682 where
1683 T: 'static,
1684 {
1685 let (subscription, activate) = self.release_listeners.insert(
1686 handle.entity_id(),
1687 Box::new(move |entity, cx| {
1688 let entity = entity.downcast_mut().expect("invalid entity type");
1689 on_release(entity, cx)
1690 }),
1691 );
1692 activate();
1693 subscription
1694 }
1695
1696 /// Observe the release of a entity. The callback is invoked after the entity
1697 /// has no more strong references but before it has been dropped.
1698 pub fn observe_release_in<T>(
1699 &self,
1700 handle: &Entity<T>,
1701 window: &Window,
1702 on_release: impl FnOnce(&mut T, &mut Window, &mut App) + 'static,
1703 ) -> Subscription
1704 where
1705 T: 'static,
1706 {
1707 let window_handle = window.handle;
1708 self.observe_release(handle, move |entity, cx| {
1709 let _ = window_handle.update(cx, |_, window, cx| on_release(entity, window, cx));
1710 })
1711 }
1712
1713 /// Register a callback to be invoked when a keystroke is received by the application
1714 /// in any window. Note that this fires after all other action and event mechanisms have resolved
1715 /// and that this API will not be invoked if the event's propagation is stopped.
1716 pub fn observe_keystrokes(
1717 &mut self,
1718 mut f: impl FnMut(&KeystrokeEvent, &mut Window, &mut App) + 'static,
1719 ) -> Subscription {
1720 fn inner(
1721 keystroke_observers: &SubscriberSet<(), KeystrokeObserver>,
1722 handler: KeystrokeObserver,
1723 ) -> Subscription {
1724 let (subscription, activate) = keystroke_observers.insert((), handler);
1725 activate();
1726 subscription
1727 }
1728
1729 inner(
1730 &self.keystroke_observers,
1731 Box::new(move |event, window, cx| {
1732 f(event, window, cx);
1733 true
1734 }),
1735 )
1736 }
1737
1738 /// Register a callback to be invoked when a keystroke is received by the application
1739 /// in any window. Note that this fires _before_ all other action and event mechanisms have resolved
1740 /// unlike [`App::observe_keystrokes`] which fires after. This means that `cx.stop_propagation` calls
1741 /// within interceptors will prevent action dispatch
1742 pub fn intercept_keystrokes(
1743 &mut self,
1744 mut f: impl FnMut(&KeystrokeEvent, &mut Window, &mut App) + 'static,
1745 ) -> Subscription {
1746 fn inner(
1747 keystroke_interceptors: &SubscriberSet<(), KeystrokeObserver>,
1748 handler: KeystrokeObserver,
1749 ) -> Subscription {
1750 let (subscription, activate) = keystroke_interceptors.insert((), handler);
1751 activate();
1752 subscription
1753 }
1754
1755 inner(
1756 &self.keystroke_interceptors,
1757 Box::new(move |event, window, cx| {
1758 f(event, window, cx);
1759 true
1760 }),
1761 )
1762 }
1763
1764 /// Register key bindings.
1765 pub fn bind_keys(&mut self, bindings: impl IntoIterator<Item = KeyBinding>) {
1766 self.keymap.borrow_mut().add_bindings(bindings);
1767 self.pending_effects.push_back(Effect::RefreshWindows);
1768 }
1769
1770 /// Clear all key bindings in the app.
1771 pub fn clear_key_bindings(&mut self) {
1772 self.keymap.borrow_mut().clear();
1773 self.pending_effects.push_back(Effect::RefreshWindows);
1774 }
1775
1776 /// Get all key bindings in the app.
1777 pub fn key_bindings(&self) -> Rc<RefCell<Keymap>> {
1778 self.keymap.clone()
1779 }
1780
1781 /// Register a global handler for actions invoked via the keyboard. These handlers are run at
1782 /// the end of the bubble phase for actions, and so will only be invoked if there are no other
1783 /// handlers or if they called `cx.propagate()`.
1784 pub fn on_action<A: Action>(&mut self, listener: impl Fn(&A, &mut Self) + 'static) {
1785 self.global_action_listeners
1786 .entry(TypeId::of::<A>())
1787 .or_default()
1788 .push(Rc::new(move |action, phase, cx| {
1789 if phase == DispatchPhase::Bubble {
1790 let action = action.downcast_ref().unwrap();
1791 listener(action, cx)
1792 }
1793 }));
1794 }
1795
1796 /// Event handlers propagate events by default. Call this method to stop dispatching to
1797 /// event handlers with a lower z-index (mouse) or higher in the tree (keyboard). This is
1798 /// the opposite of [`Self::propagate`]. It's also possible to cancel a call to [`Self::propagate`] by
1799 /// calling this method before effects are flushed.
1800 pub fn stop_propagation(&mut self) {
1801 self.propagate_event = false;
1802 }
1803
1804 /// Action handlers stop propagation by default during the bubble phase of action dispatch
1805 /// dispatching to action handlers higher in the element tree. This is the opposite of
1806 /// [`Self::stop_propagation`]. It's also possible to cancel a call to [`Self::stop_propagation`] by calling
1807 /// this method before effects are flushed.
1808 pub fn propagate(&mut self) {
1809 self.propagate_event = true;
1810 }
1811
1812 /// Build an action from some arbitrary data, typically a keymap entry.
1813 pub fn build_action(
1814 &self,
1815 name: &str,
1816 data: Option<serde_json::Value>,
1817 ) -> std::result::Result<Box<dyn Action>, ActionBuildError> {
1818 self.actions.build_action(name, data)
1819 }
1820
1821 /// Get all action names that have been registered. Note that registration only allows for
1822 /// actions to be built dynamically, and is unrelated to binding actions in the element tree.
1823 pub fn all_action_names(&self) -> &[&'static str] {
1824 self.actions.all_action_names()
1825 }
1826
1827 /// Returns key bindings that invoke the given action on the currently focused element, without
1828 /// checking context. Bindings are returned in the order they were added. For display, the last
1829 /// binding should take precedence.
1830 pub fn all_bindings_for_input(&self, input: &[Keystroke]) -> Vec<KeyBinding> {
1831 RefCell::borrow(&self.keymap).all_bindings_for_input(input)
1832 }
1833
1834 /// Get all non-internal actions that have been registered, along with their schemas.
1835 pub fn action_schemas(
1836 &self,
1837 generator: &mut schemars::SchemaGenerator,
1838 ) -> Vec<(&'static str, Option<schemars::Schema>)> {
1839 self.actions.action_schemas(generator)
1840 }
1841
1842 /// Get a map from a deprecated action name to the canonical name.
1843 pub fn deprecated_actions_to_preferred_actions(&self) -> &HashMap<&'static str, &'static str> {
1844 self.actions.deprecated_aliases()
1845 }
1846
1847 /// Get a map from an action name to the deprecation messages.
1848 pub fn action_deprecation_messages(&self) -> &HashMap<&'static str, &'static str> {
1849 self.actions.deprecation_messages()
1850 }
1851
1852 /// Get a map from an action name to the documentation.
1853 pub fn action_documentation(&self) -> &HashMap<&'static str, &'static str> {
1854 self.actions.documentation()
1855 }
1856
1857 /// Register a callback to be invoked when the application is about to quit.
1858 /// It is not possible to cancel the quit event at this point.
1859 pub fn on_app_quit<Fut>(
1860 &self,
1861 mut on_quit: impl FnMut(&mut App) -> Fut + 'static,
1862 ) -> Subscription
1863 where
1864 Fut: 'static + Future<Output = ()>,
1865 {
1866 let (subscription, activate) = self.quit_observers.insert(
1867 (),
1868 Box::new(move |cx| {
1869 let future = on_quit(cx);
1870 future.boxed_local()
1871 }),
1872 );
1873 activate();
1874 subscription
1875 }
1876
1877 /// Register a callback to be invoked when the application is about to restart.
1878 ///
1879 /// These callbacks are called before any `on_app_quit` callbacks.
1880 pub fn on_app_restart(&self, mut on_restart: impl 'static + FnMut(&mut App)) -> Subscription {
1881 let (subscription, activate) = self.restart_observers.insert(
1882 (),
1883 Box::new(move |cx| {
1884 on_restart(cx);
1885 true
1886 }),
1887 );
1888 activate();
1889 subscription
1890 }
1891
1892 /// Register a callback to be invoked when a window is closed
1893 /// The window is no longer accessible at the point this callback is invoked.
1894 pub fn on_window_closed(&self, mut on_closed: impl FnMut(&mut App) + 'static) -> Subscription {
1895 let (subscription, activate) = self.window_closed_observers.insert((), Box::new(on_closed));
1896 activate();
1897 subscription
1898 }
1899
1900 pub(crate) fn clear_pending_keystrokes(&mut self) {
1901 for window in self.windows() {
1902 window
1903 .update(self, |_, window, _| {
1904 window.clear_pending_keystrokes();
1905 })
1906 .ok();
1907 }
1908 }
1909
1910 /// Checks if the given action is bound in the current context, as defined by the app's current focus,
1911 /// the bindings in the element tree, and any global action listeners.
1912 pub fn is_action_available(&mut self, action: &dyn Action) -> bool {
1913 let mut action_available = false;
1914 if let Some(window) = self.active_window()
1915 && let Ok(window_action_available) =
1916 window.update(self, |_, window, cx| window.is_action_available(action, cx))
1917 {
1918 action_available = window_action_available;
1919 }
1920
1921 action_available
1922 || self
1923 .global_action_listeners
1924 .contains_key(&action.as_any().type_id())
1925 }
1926
1927 /// Sets the menu bar for this application. This will replace any existing menu bar.
1928 pub fn set_menus(&self, menus: Vec<Menu>) {
1929 self.platform.set_menus(menus, &self.keymap.borrow());
1930 }
1931
1932 /// Gets the menu bar for this application.
1933 pub fn get_menus(&self) -> Option<Vec<OwnedMenu>> {
1934 self.platform.get_menus()
1935 }
1936
1937 /// Sets the right click menu for the app icon in the dock
1938 pub fn set_dock_menu(&self, menus: Vec<MenuItem>) {
1939 self.platform.set_dock_menu(menus, &self.keymap.borrow())
1940 }
1941
1942 /// Performs the action associated with the given dock menu item, only used on Windows for now.
1943 pub fn perform_dock_menu_action(&self, action: usize) {
1944 self.platform.perform_dock_menu_action(action);
1945 }
1946
1947 /// Adds given path to the bottom of the list of recent paths for the application.
1948 /// The list is usually shown on the application icon's context menu in the dock,
1949 /// and allows to open the recent files via that context menu.
1950 /// If the path is already in the list, it will be moved to the bottom of the list.
1951 pub fn add_recent_document(&self, path: &Path) {
1952 self.platform.add_recent_document(path);
1953 }
1954
1955 /// Updates the jump list with the updated list of recent paths for the application, only used on Windows for now.
1956 /// Note that this also sets the dock menu on Windows.
1957 pub fn update_jump_list(
1958 &self,
1959 menus: Vec<MenuItem>,
1960 entries: Vec<SmallVec<[PathBuf; 2]>>,
1961 ) -> Vec<SmallVec<[PathBuf; 2]>> {
1962 self.platform.update_jump_list(menus, entries)
1963 }
1964
1965 /// Dispatch an action to the currently active window or global action handler
1966 /// See [`crate::Action`] for more information on how actions work
1967 pub fn dispatch_action(&mut self, action: &dyn Action) {
1968 if let Some(active_window) = self.active_window() {
1969 active_window
1970 .update(self, |_, window, cx| {
1971 window.dispatch_action(action.boxed_clone(), cx)
1972 })
1973 .log_err();
1974 } else {
1975 self.dispatch_global_action(action);
1976 }
1977 }
1978
1979 fn dispatch_global_action(&mut self, action: &dyn Action) {
1980 self.propagate_event = true;
1981
1982 if let Some(mut global_listeners) = self
1983 .global_action_listeners
1984 .remove(&action.as_any().type_id())
1985 {
1986 for listener in &global_listeners {
1987 listener(action.as_any(), DispatchPhase::Capture, self);
1988 if !self.propagate_event {
1989 break;
1990 }
1991 }
1992
1993 global_listeners.extend(
1994 self.global_action_listeners
1995 .remove(&action.as_any().type_id())
1996 .unwrap_or_default(),
1997 );
1998
1999 self.global_action_listeners
2000 .insert(action.as_any().type_id(), global_listeners);
2001 }
2002
2003 if self.propagate_event
2004 && let Some(mut global_listeners) = self
2005 .global_action_listeners
2006 .remove(&action.as_any().type_id())
2007 {
2008 for listener in global_listeners.iter().rev() {
2009 listener(action.as_any(), DispatchPhase::Bubble, self);
2010 if !self.propagate_event {
2011 break;
2012 }
2013 }
2014
2015 global_listeners.extend(
2016 self.global_action_listeners
2017 .remove(&action.as_any().type_id())
2018 .unwrap_or_default(),
2019 );
2020
2021 self.global_action_listeners
2022 .insert(action.as_any().type_id(), global_listeners);
2023 }
2024 }
2025
2026 /// Is there currently something being dragged?
2027 pub fn has_active_drag(&self) -> bool {
2028 self.active_drag.is_some()
2029 }
2030
2031 /// Gets the cursor style of the currently active drag operation.
2032 pub fn active_drag_cursor_style(&self) -> Option<CursorStyle> {
2033 self.active_drag.as_ref().and_then(|drag| drag.cursor_style)
2034 }
2035
2036 /// Stops active drag and clears any related effects.
2037 pub fn stop_active_drag(&mut self, window: &mut Window) -> bool {
2038 if self.active_drag.is_some() {
2039 self.active_drag = None;
2040 window.refresh();
2041 true
2042 } else {
2043 false
2044 }
2045 }
2046
2047 /// Sets the cursor style for the currently active drag operation.
2048 pub fn set_active_drag_cursor_style(
2049 &mut self,
2050 cursor_style: CursorStyle,
2051 window: &mut Window,
2052 ) -> bool {
2053 if let Some(ref mut drag) = self.active_drag {
2054 drag.cursor_style = Some(cursor_style);
2055 window.refresh();
2056 true
2057 } else {
2058 false
2059 }
2060 }
2061
2062 /// Set the prompt renderer for GPUI. This will replace the default or platform specific
2063 /// prompts with this custom implementation.
2064 pub fn set_prompt_builder(
2065 &mut self,
2066 renderer: impl Fn(
2067 PromptLevel,
2068 &str,
2069 Option<&str>,
2070 &[PromptButton],
2071 PromptHandle,
2072 &mut Window,
2073 &mut App,
2074 ) -> RenderablePromptHandle
2075 + 'static,
2076 ) {
2077 self.prompt_builder = Some(PromptBuilder::Custom(Box::new(renderer)));
2078 }
2079
2080 /// Reset the prompt builder to the default implementation.
2081 pub fn reset_prompt_builder(&mut self) {
2082 self.prompt_builder = Some(PromptBuilder::Default);
2083 }
2084
2085 /// Remove an asset from GPUI's cache
2086 pub fn remove_asset<A: Asset>(&mut self, source: &A::Source) {
2087 let asset_id = (TypeId::of::<A>(), hash(source));
2088 self.loading_assets.remove(&asset_id);
2089 }
2090
2091 /// Asynchronously load an asset, if the asset hasn't finished loading this will return None.
2092 ///
2093 /// Note that the multiple calls to this method will only result in one `Asset::load` call at a
2094 /// time, and the results of this call will be cached
2095 pub fn fetch_asset<A: Asset>(&mut self, source: &A::Source) -> (Shared<Task<A::Output>>, bool) {
2096 let asset_id = (TypeId::of::<A>(), hash(source));
2097 let mut is_first = false;
2098 let task = self
2099 .loading_assets
2100 .remove(&asset_id)
2101 .map(|boxed_task| *boxed_task.downcast::<Shared<Task<A::Output>>>().unwrap())
2102 .unwrap_or_else(|| {
2103 is_first = true;
2104 let future = A::load(source.clone(), self);
2105
2106 self.background_executor().spawn(future).shared()
2107 });
2108
2109 self.loading_assets.insert(asset_id, Box::new(task.clone()));
2110
2111 (task, is_first)
2112 }
2113
2114 /// Obtain a new [`FocusHandle`], which allows you to track and manipulate the keyboard focus
2115 /// for elements rendered within this window.
2116 #[track_caller]
2117 pub fn focus_handle(&self) -> FocusHandle {
2118 FocusHandle::new(&self.focus_handles)
2119 }
2120
2121 /// Tell GPUI that an entity has changed and observers of it should be notified.
2122 pub fn notify(&mut self, entity_id: EntityId) {
2123 let window_invalidators = mem::take(
2124 self.window_invalidators_by_entity
2125 .entry(entity_id)
2126 .or_default(),
2127 );
2128
2129 if window_invalidators.is_empty() {
2130 if self.pending_notifications.insert(entity_id) {
2131 self.pending_effects
2132 .push_back(Effect::Notify { emitter: entity_id });
2133 }
2134 } else {
2135 for invalidator in window_invalidators.values() {
2136 invalidator.invalidate_view(entity_id, self);
2137 }
2138 }
2139
2140 self.window_invalidators_by_entity
2141 .insert(entity_id, window_invalidators);
2142 }
2143
2144 /// Returns the name for this [`App`].
2145 #[cfg(any(test, feature = "test-support", debug_assertions))]
2146 pub fn get_name(&self) -> Option<&'static str> {
2147 self.name
2148 }
2149
2150 /// Returns `true` if the platform file picker supports selecting a mix of files and directories.
2151 pub fn can_select_mixed_files_and_dirs(&self) -> bool {
2152 self.platform.can_select_mixed_files_and_dirs()
2153 }
2154
2155 /// Removes an image from the sprite atlas on all windows.
2156 ///
2157 /// If the current window is being updated, it will be removed from `App.windows`, you can use `current_window` to specify the current window.
2158 /// This is a no-op if the image is not in the sprite atlas.
2159 pub fn drop_image(&mut self, image: Arc<RenderImage>, current_window: Option<&mut Window>) {
2160 // remove the texture from all other windows
2161 for window in self.windows.values_mut().flatten() {
2162 _ = window.drop_image(image.clone());
2163 }
2164
2165 // remove the texture from the current window
2166 if let Some(window) = current_window {
2167 _ = window.drop_image(image);
2168 }
2169 }
2170
2171 /// Sets the renderer for the inspector.
2172 #[cfg(any(feature = "inspector", debug_assertions))]
2173 pub fn set_inspector_renderer(&mut self, f: crate::InspectorRenderer) {
2174 self.inspector_renderer = Some(f);
2175 }
2176
2177 /// Registers a renderer specific to an inspector state.
2178 #[cfg(any(feature = "inspector", debug_assertions))]
2179 pub fn register_inspector_element<T: 'static, R: crate::IntoElement>(
2180 &mut self,
2181 f: impl 'static + Fn(crate::InspectorElementId, &T, &mut Window, &mut App) -> R,
2182 ) {
2183 self.inspector_element_registry.register(f);
2184 }
2185
2186 /// Initializes gpui's default colors for the application.
2187 ///
2188 /// These colors can be accessed through `cx.default_colors()`.
2189 pub fn init_colors(&mut self) {
2190 self.set_global(GlobalColors(Arc::new(Colors::default())));
2191 }
2192}
2193
2194impl AppContext for App {
2195 type Result<T> = T;
2196
2197 /// Builds an entity that is owned by the application.
2198 ///
2199 /// The given function will be invoked with a [`Context`] and must return an object representing the entity. An
2200 /// [`Entity`] handle will be returned, which can be used to access the entity in a context.
2201 fn new<T: 'static>(&mut self, build_entity: impl FnOnce(&mut Context<T>) -> T) -> Entity<T> {
2202 self.update(|cx| {
2203 let slot = cx.entities.reserve();
2204 let handle = slot.clone();
2205 let entity = build_entity(&mut Context::new_context(cx, slot.downgrade()));
2206
2207 cx.push_effect(Effect::EntityCreated {
2208 entity: handle.clone().into_any(),
2209 tid: TypeId::of::<T>(),
2210 window: cx.window_update_stack.last().cloned(),
2211 });
2212
2213 cx.entities.insert(slot, entity);
2214 handle
2215 })
2216 }
2217
2218 fn reserve_entity<T: 'static>(&mut self) -> Self::Result<Reservation<T>> {
2219 Reservation(self.entities.reserve())
2220 }
2221
2222 fn insert_entity<T: 'static>(
2223 &mut self,
2224 reservation: Reservation<T>,
2225 build_entity: impl FnOnce(&mut Context<T>) -> T,
2226 ) -> Self::Result<Entity<T>> {
2227 self.update(|cx| {
2228 let slot = reservation.0;
2229 let entity = build_entity(&mut Context::new_context(cx, slot.downgrade()));
2230 cx.entities.insert(slot, entity)
2231 })
2232 }
2233
2234 /// Updates the entity referenced by the given handle. The function is passed a mutable reference to the
2235 /// entity along with a `Context` for the entity.
2236 fn update_entity<T: 'static, R>(
2237 &mut self,
2238 handle: &Entity<T>,
2239 update: impl FnOnce(&mut T, &mut Context<T>) -> R,
2240 ) -> R {
2241 self.update(|cx| {
2242 let mut entity = cx.entities.lease(handle);
2243 let result = update(
2244 &mut entity,
2245 &mut Context::new_context(cx, handle.downgrade()),
2246 );
2247 cx.entities.end_lease(entity);
2248 result
2249 })
2250 }
2251
2252 fn as_mut<'a, T>(&'a mut self, handle: &Entity<T>) -> GpuiBorrow<'a, T>
2253 where
2254 T: 'static,
2255 {
2256 GpuiBorrow::new(handle.clone(), self)
2257 }
2258
2259 fn read_entity<T, R>(
2260 &self,
2261 handle: &Entity<T>,
2262 read: impl FnOnce(&T, &App) -> R,
2263 ) -> Self::Result<R>
2264 where
2265 T: 'static,
2266 {
2267 let entity = self.entities.read(handle);
2268 read(entity, self)
2269 }
2270
2271 fn update_window<T, F>(&mut self, handle: AnyWindowHandle, update: F) -> Result<T>
2272 where
2273 F: FnOnce(AnyView, &mut Window, &mut App) -> T,
2274 {
2275 self.update_window_id(handle.id, update)
2276 }
2277
2278 fn read_window<T, R>(
2279 &self,
2280 window: &WindowHandle<T>,
2281 read: impl FnOnce(Entity<T>, &App) -> R,
2282 ) -> Result<R>
2283 where
2284 T: 'static,
2285 {
2286 let window = self
2287 .windows
2288 .get(window.id)
2289 .context("window not found")?
2290 .as_deref()
2291 .expect("attempted to read a window that is already on the stack");
2292
2293 let root_view = window.root.clone().unwrap();
2294 let view = root_view
2295 .downcast::<T>()
2296 .map_err(|_| anyhow!("root view's type has changed"))?;
2297
2298 Ok(read(view, self))
2299 }
2300
2301 fn background_spawn<R>(&self, future: impl Future<Output = R> + Send + 'static) -> Task<R>
2302 where
2303 R: Send + 'static,
2304 {
2305 self.background_executor.spawn(future)
2306 }
2307
2308 fn read_global<G, R>(&self, callback: impl FnOnce(&G, &App) -> R) -> Self::Result<R>
2309 where
2310 G: Global,
2311 {
2312 let mut g = self.global::<G>();
2313 callback(g, self)
2314 }
2315}
2316
2317/// These effects are processed at the end of each application update cycle.
2318pub(crate) enum Effect {
2319 Notify {
2320 emitter: EntityId,
2321 },
2322 Emit {
2323 emitter: EntityId,
2324 event_type: TypeId,
2325 event: Box<dyn Any>,
2326 },
2327 RefreshWindows,
2328 NotifyGlobalObservers {
2329 global_type: TypeId,
2330 },
2331 Defer {
2332 callback: Box<dyn FnOnce(&mut App) + 'static>,
2333 },
2334 EntityCreated {
2335 entity: AnyEntity,
2336 tid: TypeId,
2337 window: Option<WindowId>,
2338 },
2339}
2340
2341impl std::fmt::Debug for Effect {
2342 fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
2343 match self {
2344 Effect::Notify { emitter } => write!(f, "Notify({})", emitter),
2345 Effect::Emit { emitter, .. } => write!(f, "Emit({:?})", emitter),
2346 Effect::RefreshWindows => write!(f, "RefreshWindows"),
2347 Effect::NotifyGlobalObservers { global_type } => {
2348 write!(f, "NotifyGlobalObservers({:?})", global_type)
2349 }
2350 Effect::Defer { .. } => write!(f, "Defer(..)"),
2351 Effect::EntityCreated { entity, .. } => write!(f, "EntityCreated({:?})", entity),
2352 }
2353 }
2354}
2355
2356/// Wraps a global variable value during `update_global` while the value has been moved to the stack.
2357pub(crate) struct GlobalLease<G: Global> {
2358 global: Box<dyn Any>,
2359 global_type: PhantomData<G>,
2360}
2361
2362impl<G: Global> GlobalLease<G> {
2363 fn new(global: Box<dyn Any>) -> Self {
2364 GlobalLease {
2365 global,
2366 global_type: PhantomData,
2367 }
2368 }
2369}
2370
2371impl<G: Global> Deref for GlobalLease<G> {
2372 type Target = G;
2373
2374 fn deref(&self) -> &Self::Target {
2375 self.global.downcast_ref().unwrap()
2376 }
2377}
2378
2379impl<G: Global> DerefMut for GlobalLease<G> {
2380 fn deref_mut(&mut self) -> &mut Self::Target {
2381 self.global.downcast_mut().unwrap()
2382 }
2383}
2384
2385/// Contains state associated with an active drag operation, started by dragging an element
2386/// within the window or by dragging into the app from the underlying platform.
2387pub struct AnyDrag {
2388 /// The view used to render this drag
2389 pub view: AnyView,
2390
2391 /// The value of the dragged item, to be dropped
2392 pub value: Arc<dyn Any>,
2393
2394 /// This is used to render the dragged item in the same place
2395 /// on the original element that the drag was initiated
2396 pub cursor_offset: Point<Pixels>,
2397
2398 /// The cursor style to use while dragging
2399 pub cursor_style: Option<CursorStyle>,
2400}
2401
2402/// Contains state associated with a tooltip. You'll only need this struct if you're implementing
2403/// tooltip behavior on a custom element. Otherwise, use [Div::tooltip](crate::Interactivity::tooltip).
2404#[derive(Clone)]
2405pub struct AnyTooltip {
2406 /// The view used to display the tooltip
2407 pub view: AnyView,
2408
2409 /// The absolute position of the mouse when the tooltip was deployed.
2410 pub mouse_position: Point<Pixels>,
2411
2412 /// Given the bounds of the tooltip, checks whether the tooltip should still be visible and
2413 /// updates its state accordingly. This is needed atop the hovered element's mouse move handler
2414 /// to handle the case where the element is not painted (e.g. via use of `visible_on_hover`).
2415 pub check_visible_and_update: Rc<dyn Fn(Bounds<Pixels>, &mut Window, &mut App) -> bool>,
2416}
2417
2418/// A keystroke event, and potentially the associated action
2419#[derive(Debug)]
2420pub struct KeystrokeEvent {
2421 /// The keystroke that occurred
2422 pub keystroke: Keystroke,
2423
2424 /// The action that was resolved for the keystroke, if any
2425 pub action: Option<Box<dyn Action>>,
2426
2427 /// The context stack at the time
2428 pub context_stack: Vec<KeyContext>,
2429}
2430
2431struct NullHttpClient;
2432
2433impl HttpClient for NullHttpClient {
2434 fn send(
2435 &self,
2436 _req: http_client::Request<http_client::AsyncBody>,
2437 ) -> futures::future::BoxFuture<
2438 'static,
2439 anyhow::Result<http_client::Response<http_client::AsyncBody>>,
2440 > {
2441 async move {
2442 anyhow::bail!("No HttpClient available");
2443 }
2444 .boxed()
2445 }
2446
2447 fn user_agent(&self) -> Option<&http_client::http::HeaderValue> {
2448 None
2449 }
2450
2451 fn proxy(&self) -> Option<&Url> {
2452 None
2453 }
2454}
2455
2456/// A mutable reference to an entity owned by GPUI
2457pub struct GpuiBorrow<'a, T> {
2458 inner: Option<Lease<T>>,
2459 app: &'a mut App,
2460}
2461
2462impl<'a, T: 'static> GpuiBorrow<'a, T> {
2463 fn new(inner: Entity<T>, app: &'a mut App) -> Self {
2464 app.start_update();
2465 let lease = app.entities.lease(&inner);
2466 Self {
2467 inner: Some(lease),
2468 app,
2469 }
2470 }
2471}
2472
2473impl<'a, T: 'static> std::borrow::Borrow<T> for GpuiBorrow<'a, T> {
2474 fn borrow(&self) -> &T {
2475 self.inner.as_ref().unwrap().borrow()
2476 }
2477}
2478
2479impl<'a, T: 'static> std::borrow::BorrowMut<T> for GpuiBorrow<'a, T> {
2480 fn borrow_mut(&mut self) -> &mut T {
2481 self.inner.as_mut().unwrap().borrow_mut()
2482 }
2483}
2484
2485impl<'a, T: 'static> std::ops::Deref for GpuiBorrow<'a, T> {
2486 type Target = T;
2487
2488 fn deref(&self) -> &Self::Target {
2489 self.inner.as_ref().unwrap()
2490 }
2491}
2492
2493impl<'a, T: 'static> std::ops::DerefMut for GpuiBorrow<'a, T> {
2494 fn deref_mut(&mut self) -> &mut T {
2495 self.inner.as_mut().unwrap()
2496 }
2497}
2498
2499impl<'a, T> Drop for GpuiBorrow<'a, T> {
2500 fn drop(&mut self) {
2501 let lease = self.inner.take().unwrap();
2502 self.app.notify(lease.id);
2503 self.app.entities.end_lease(lease);
2504 self.app.finish_update();
2505 }
2506}
2507
2508#[cfg(test)]
2509mod test {
2510 use std::{cell::RefCell, rc::Rc};
2511
2512 use crate::{AppContext, TestAppContext};
2513
2514 #[test]
2515 fn test_gpui_borrow() {
2516 let cx = TestAppContext::single();
2517 let observation_count = Rc::new(RefCell::new(0));
2518
2519 let state = cx.update(|cx| {
2520 let state = cx.new(|_| false);
2521 cx.observe(&state, {
2522 let observation_count = observation_count.clone();
2523 move |_, _| {
2524 let mut count = observation_count.borrow_mut();
2525 *count += 1;
2526 }
2527 })
2528 .detach();
2529
2530 state
2531 });
2532
2533 cx.update(|cx| {
2534 // Calling this like this so that we don't clobber the borrow_mut above
2535 *std::borrow::BorrowMut::borrow_mut(&mut state.as_mut(cx)) = true;
2536 });
2537
2538 cx.update(|cx| {
2539 state.write(cx, false);
2540 });
2541
2542 assert_eq!(*observation_count.borrow(), 2);
2543 }
2544}